Electric circuit breaker



July 9 1929. l H. P. CHANDLER 1.720.263

' I ELECTRIC CIRCUIT BREAKER Filed Aprii 3, 1925 s sheets-sheet 1 July 9, 1929. H. P, CHANDLER ELECTRIC CIRCUVITBREAKER Filed April 5. 1925 3 Sheets-Sheet 2 l F26. i l

July 9, 1929. CHANDLER v1.720.263

ELECTRIC CIRCUIT BREAKER @www Patented July 9, i929.

UNITED STATES f V y 1,720,263 PATENT oFFlcE.

HOHER P. CHANDLER, OF MANSFIELD, OHIO, ASSIGNOR T ".IIHE OHIO BRASSACOH- p PANY, OF MANSFIELD, OHIO, A

CORPORATION 0E NEW JERSEY.

ELECTRIC CIRCUIT' EREAKER.

nppneation med April 3,

My invention relates to an electric circuit controlling device and has particular reference to that type of control which has a plurality of breaks which are in serles and are closed in sequence and in which one o f the breaks is arranged to open automatically when there is an excess current fiowlng in the circuit. The breaks are also arranged so that in closing-the circuit the automatic ltr-opening breaker is firstclosed by moving one of the other breakers to an open position so as to maintain'the circuit open while the automatic break Vis being closed after which the circuit is closed by the other break or breakers and preferably through manual operation. These breakers may also Lbe termed switches. l

Another object of my invention is to provide a mechanism in which the automatic 420 circuit `breaker will automatically I open.

whenever there is a movement in the other break or breakers having a tendency to open the circuit, and this arrangement will provide'for a quick opening of the circuit prior to the manual operated breaker opening the l circuit.l

Another object of my invention is to pro- :vide a device in which the mechanism will automatically open the circuit uponanex- 50 cess of current in the circuit.

Another object of my invention is to provide a mechanism in'which it is impossiblev to close the -fcircuit until the automatic breaker has been previously closed.

Another object of my invention is to pro vide a mechanism in which the circuit can be opened by hand at the will of an operator, but the circuit will be initially and automatically opened b an automatic breaker. prior to the circuit icing opened by hand.

Another object of my invention is to 4pre- Vent the Aopening of thecircuit either through the automatic breaker or the hand breaker until the hand breaker has been completely closeda It is quite usual in connection with cir-l cuits carrying heavy currents to provide in the circuit a switch to automatically break the circuit in case of an overload, and also a switch in series with the automatic 'switch and operated by hand to open and close the circuit and these switches are independent in operation. 'lhe intention of 'such an arrangement is that the operator in order to close the circuit will irst close the auto- 1925. serial No. aoas.

matic switch by hand and then close' the manually operated switch, but this is rnot always followed and the result is that the operator may close the manually operated switch .first and then attempt to closethe automatic switch and if there is a short circuit or overload on the line and he attempts to hold the` automatic switch closed as he can. do, trouble is likely to result, or if he allows the automatic switch to'open it may result in injury to the operator.

Again, with the arrangement just described it is possible for an operator to open the circuit by first operating the manually operated switch, which is notconst'ructed asa rule to open circuits carrying a heavy current and the resultmay be very disastrous 'to the operator andltheapparatus.

In my invention I have so combined the automatic and manually `operated switches that they will, still operate in Series, but it is impossible to ,completely close the circuit unt-il the automatic switch has first been closed and is free tof automatically open Vas soon as the manually operated switchis moved to its closed position to complete the circuit, also it is impossible for the operator to open the circuit without first tripping the automatic switch to open the circuit and this action is followed by the opening of the manually yoperated switch. These operations are brought about through the operation of a single handle moved in the proper directions.

I have shown'the switching mechanism as enclosed in a receptacle suitable for use in mines where the conditions are severe. Under such use the air is usually heavily charged with moisture which is very likely to condense, and, therefore, I install the switching appartus in a substantially enclosed receptacle formed of insulating ina-- terial and provided with venting means such that the gases formed within the receptacle upon the 'opening `of the automatic switch may escape. At the same time, the venting is of such construction that-the arc ,formed within the receptacle will be confined to the' receptacle and thereby the ignition of external gases'prevented.

My invention resides in the new and novel construction, combination and relation of the Various partshereinafter fully described and in connection with the drawings accompanying this specification in which:

Fig. 1 is one face view of my invention in partial section and with the cover removed and shows the hand and automatic switches in closed relation with respect to t-he circuit.

Fig. 2 shows another face view ofJ my invention, opposite to that shown in Fig. 1, in partial section with the cover removed.

Fig. 3 is a sectional view of by invention shownv on the zig-zag line 3 3 of Fig. 1.

Fig. 4 is a detail view of the automatic locking and tripping mechanism on the line 4 4 of Fig. 1, and is for the purpose of maintaining the automatic switch in closed position, but automatically releasing theI same upon an'excess curI'ent in the circuit or upon a movement of the operating handle at will ofthe operator in a direction to open the hand operated switch.

F ig. 5 is a sectional view of the mechanism in Fig. 4, but shown on the line 5 5 of Fig. 1. y

Fig. 6 is a detail of the same operating mechanism shown in Fig. 4, but taken on theV line 6 6 of Fig. l. y

Fig. 7 is a detail View of a locking mechanism taken on the line 7 7 of Fig. 1 and is .for the purpose of preventing the opening of the switch until the hand operated switch has beenmoved to its full closed position.

In the preferred embodiment of my invention I employ a caslng v1 preferably of insulating material and formed to any shape desired to meet requirements. Formed within the casing is a transverse insulating partition 2 and provided with an opening therein `to receive the operating shaft 3 which projects through the side of the casing and acts as a core for the overload tripping coil 4. Mounted Within the casing 1 and projecting therefrom is an arc chute 5 which has a cap 6 mounted thereon and secured to the chuter5 by means of the screws l 7. Between the chute 5 and t e cap 6 is an air space 8 communicating wit the interior of the chute 5 so that any gases formed with,- in the casing 1 will be allowed to escape fromwithin the casing.` It will be understood, of course, that the opposite faces of the'casing 1 shown in Figs. 1 and 2 are provided with covers 9 and 10 and. these covers are secured to the casing 1 by means of .fastening devices 11 land 11a which are shown as through bolts and; lugs with a nut 12 at vone end, and these bolts llyextend through the openings 13 in the casing 1 and the lugs 11a provide means to secure the device in position. The cover 10 is provided with a tight fitting opening'to receive the shaft 3 and is provided with abushing 14. Secured to the exterior end of the shaft 3 is an insulating handle 15 which Ihave vshownployed. By employing the member 3 as I do, it permits me to operate the mechanism the binding post 17 and the other end connccted to the terminal 18 which is part of the stationary terminal for the manually operated switch.

Further referring to Figs. 2 and 3, there is mounted in the diaphragm 2 and adjacent to the coil 4 another coil 19 which is likewise woundwith flat copper ribbon 20 and has one end connected to the terminal 21 and the other end connected to the terminal 22 which is the fixed terminal for the automatic opening switch. The terminals 17 and 2l are arranged for the connection thereto of the line circuit conductors 23 and 24. 'lhe terminals 17 and 21 comprise a metallic stud having the enlarged portion 25 with an opening therein to receive the terminal 26 of the cables 23 and 24 and preferably soldered thereto. The terminals 17 and 2l are provided with an exterior insulating receptacle 27 and the parts are held in position on the casing 1 by the nut and washer 28 and the terminals of the coils are held in position with respect to the terminals 17 and 21 by means of the nuts 29.

Referring further to the coil 19, I pro-v A vide'the same with a soft iron core 30l having 011e end positioned against the dia-` phragm 2 and the other end vprojecting be,-

yond the coil 19 and provided with a soft' .30 on one side.

Mountedl on the shaft 3 and secured in rotatable relation therewith is a switch4 blade 32'provided with a collar portion 33 in fixed engagement with the shaft 3. The blade 32 is adapted to engage between the fixedblades 34 and held by friction and.

when in engagement with the blades 34 the break in the circuit due to the manually operated blades 32 is closed.

Mounted upon the outer surface of the collar portion 33 of the blade 32, and rotatable relative thereto, is the autoiatically opening switch blade 35 composed preferably of a plurality of `copper leaves secured to the carrier 36 which isprovided with the collar portion 37 surrounding the collar portion 33. The switch blade 35 engages the terminal 32 which is secured to the insulating diaphragm'2 by means of the screws 38. The terminal .22 is provided with a stud 39 which projects through the diaphragm 2 and is connected to one end of the ribbon'by means of the nut 40. Integrall secured tothe outer surface of the collar 3 lis a projecting lug 41 to which is secured the blade 35 is open that the lug 45 4will enthe spring 42 and which in turn is secured to a post 43 rigidly mounted in the diaphragm 2. The spring 42 is under tension and tends constantly to rotate the Jswitch blade 35 about the axis of the shaft 3`i'n a direction to .open the switch. The switch blade 32 has, mounted upon its collar portion 33 an integral lug 4l and the collar portion 37 of the switch blade35 has integrally secured thereto a lug 'which is arranged to engage the lug 44 when the switch 35 is in an open position and held in engagement by vmea-ns of the spring 42.

It will now be evident fthat it' the switch blades 32 and 35 are in a closed position, as shown in Fig. 1, that there is a complete circuit from the cable 23 to the cable 24 through the terminal 17, the conductor 1G to the terminal' membei' A18, through the switch blade 32 and through the switch blade 35 to the terminal 22 and from there through the conductor 20 of the coil. 19 to the terminal 21 and thence to the cable 24. It will also be evident that if t-lie switch blade 32 is closed with relation to the terminal 18 and gage the lug 44 and if the handle l5 is moved in the direction of the arrow A that the switch blade 35 will be rotated about the axis of the shaft 3 and into engagement with the terminal 22 and will be held in that posias already pointed out, between the cables 23 and 24.

As already stated, I employ a mechanism for automatically locking the switch blade 35 in its closed position with the terminal 22 and this mechanism is also operable to release the blade 35 upon an excess'current in the circuit controlled by the switch, or upon a movement of the handle 15 in the direction .of the arrow A providing thev switch 35 is in its closed position. The automatic locking and tripping mechanism for the blade 35 comprises a base member 46 secured to the insulating'l diaphragm 2 by means of the screws 47.

The basey member 46 is provided with the Vspaced and overhanging arms 48 between which is pivoted, by means of the pin 49, a member 50, made of soft iron, and having one end positioned ,over thev end of the operating shaft or core 3 and spaced thererom. -This member 50 may be termed an armature as it iscaused to move aboutthe 4pin 49 when the end thereof is'attracted by the core 3 of the coil 4 lwhen an excess. of current is owing therethrough. Referring to Fig. 5, the amature is proin the core 3 may be val'ied so that the cur-- rent value in the circuit 23 at which the automatic switch 35 will open can be adjusted.

The screw 53vadjusts the relation ofthe armature with respect to the core 3.

To the base member 46 are also secured the spaced supports 54 to which is pivoted an arm 55 by means of the pin 56.` The arm 55 overhangs the pin 56 at the pivoted end and interposed between the hase 46 and the end `ot' the arm 55 is a'spring 57 tending to aid gravity in moving andmaintaining the opposite end in a downward position, but permitting the same to move-upward with a' movement of the armature 50. The armature 50 and arm 55 are connected together by means of the adjustable connection 58 by means of which t-lie relation between the arm 55 and armature 50 may be changed and which will cause the arm 55 to-be moved upwardly about the pin 56 when the-armature 5() is pivoted `about its pin 49 either through an excess of current. or throu h movement ofthe operating handle 15 in t ie direct-ion of the arrow A, and this latter operation will be described shortly.

Projecting radially from the member 3 7 i is .an arm 59 provided with a roller 60` mounted upon the pin 61 and the roller is adapted to engage with the end of the arm 55 when-the armv is in its lowered position and the engagement of the arm 59 with respect to the switch blade 35 and with the arm 55 is such that when the blade 35 ism its closed `position the roller 60 Will abut against the end face of the arm 55 and the arm 59 will be maintained in the position shown in Fig. 4 and the switch blade 35 in enga-gement with the contact 22. When the arm 55 is raised through the raising of the armature 50, as for instance, by an excess of current in the coil 4 then the arm 59 is free vto move to the left, (see Fig. 4),' and the switch blade 35 to move outofengagement with the contacts 22v through the tension of the spring 42. This will" then bring' the.

.face of thelug 45 into engagement with the lug/44. l

Referring to Fig. 6, I have Vshown mounted upon the switch blade 32 by means of screws 62a forked member.63 between which is mounted a latch 64 to pivot about the pin 65 constantly urged by the spring 66 to move in the direction indicated by the arrow. The armature 50 is provided with ashoulder 67 which isadapted to be engaged by the latch 64 when the blade 32 is moved in a direction` to open theswitch or'w'lien the handle 15 is moved in the direction of the arrow A.- When the latch 64 engages the shoulder 67 and the movement of the blade 32 is continued the tendency for the latch will be to pivot about the pin 65 in the direction shown by the arrow, and this will lengthen the vertical height between the pin and the point of the latch 64 and this will cause the arni 50 to be moved downward and the result will be the saine as though the armature had been moved through excess energization of the core 3, and the arm 55 willy beeraised and the switch blade 35 allowed tdinove to its open position under the influencef of the spring. 42. The relation of the latch 64 with respect to the ledge 67 is such that the blade 32 will not be out of engagement with the fixed contact blades 34 prior to the releasing of the switch blade 35. From this it -will be seen that when the operator desires to open vthe circuit he has only to move tlie handle 15 in the direction of the arrow A whereupon the latch 64 will so engage with the ledge 67 on the armature as to cause the armature 50 to release the automatic switch blade 35, permitting the switch blade 35 to open the ciiciiit prior to the opening of the circuitvby means of`tlie blade 32 at the contacts 34.

From the description thus far, it will be seen that it will be impossible for an operator to completely `close the circuit between the cables 23 and 24 without first closing the automatic switch blade 35 and then v*closing the manually operated switch 32, and it will also be observed that it is impossible for the operator to open the circuit between the conductors 23 and 24 without first causing the automatic switch 35 to open and this switch is arranged to open the circuit in the most efficient manner, namely; by a quick movement through a sudden release of the latching mechanism and the 'influence of the spring- 42 and through a magnetic blow-out.

The magnetic blow-oiit comprises the plate 68, of soft iron, secured between the insulating member 69 and the side of the chute 5. This p1ate`68 is so bent, as shown in Fig. `3, that one end will rest upon the end of the core 3 so that the plate 68 will be magnetized whenever'current is flowing through the' coil 4, and as` this plate 68 rests opposite-the core 30, lines of 'force will pass between the core 30 andthe plate 68 and between the core 30 and the plate 68 the arc is' broken when the switch blade 35 'opens and thearc will be extinguished through the influence of the magnetic lines of force.

In order to compel the operator to move the switch blade 32 to its farthest closed position so as to insure the latch 64 engaging t-he armature 50, back of the ledge 67, I mount on the member 2 a plate 7 0y and this V, plate isv provided with a plurality of teeth 71. V'Pivotallywmounted on'the arm 32 is a latch 72 similar tothe latchA 64. Thisllatch is urged to the leftby means of the spring 73 and when the switch 32 is so positioned that `the latch 64 properly engages the armature 5() the latch 72 will have passed beyond the teeth 71 ot' the plate 70. When the operator moves the switch plate to an open position with the latch 72, as just described, it will pivot about its pin as the point of the lach 72 passes over the teeth 71. If, however, the switch blade 32 was not moved fai' enough to its closed position'the lower edge of the latch 72 will still be 1n engagement with the teeth 71 and when the operator then tends to open the switchvblade 32 the engagement of the latch 72 "with the teeth will prevent his doing so thereby making it necessary for him to move the operating handle 15 in the direction of the arrow .B a sufiicient amount so that the latch 64 will engage with the armature 50, after which the operator then will be able to open the switch as desired.

The exposed end of the shaft 3, I protect by means of an enclosing cap of insulating material 74. U

The operation of my invention is as follows: 1

In Fig. 1 I have shown the switch in a closed position and in order to open the switch it is only necessary for the operator to move the handle 15 in the direction of the arrow A and this in turn will ca use the llatch 64 to engage the armature 50 in such a manner as to depress the saine thereby raising the arm and releasing the automatic switch blade 35, whereupon the spring 42 willcause the blade 35 to move out of engagement with the contacta 32 at a high rate of speed and the magnetism in the coils 4 and 19 will produce an extinguishing effeet upon the arc thereby opening the circuit quickly and efficiently. As soon as the automatic switch 35 is open further movement of thehandle 15 in tlie direction A is unnecessar Iii order to close lthe circuit, however, it is necessary to move the switch handle 15 in the direction of the arrow A and the e ngagement of the lug 44 with the lug 45 will' cause the switch blade 35 tomove into enl gagement with the contact 22 and when the blade has moved sufficiently fanthe roller will have passed beyond the end of the arm 55, allowing the arm to drop. and engage with the roller 60 thereby maintaining the blade 35 in engagement with the Contact 22 and placing the spring 42 under tension. In order to. completey the closing of the circuit, it is then necessary for the operator to move the switch handle 15 in the direction of the i of the arrow B the latch 64 will engage with the armature 50, as already explained, resettingthe mechanism for operation.

With the switch closed, as shown in Fig. 1, andl with an excess of current flowing through the switch, the coil 4 will .be energized beyond a predetermined amount and this `will cause the armature 50 to be attracted thereby releasing the automatic switch through the raising of the arm 55 and the circuit will be automatically opened after which it maybe closed, as already explained, but making it necessary to first close the automatic switch blade-35 so that should there be any short circuit or overload upon the line, the switch blade l35 is vfree to open automatically immediately upon the closing of the switch blade 32. In closing the switch, if the operator has not moved the handle a snfiicient distance in the direction of the arrow B then he will be unable to open the switch as the latch 72 will engage with the teeth 71 and this will cause him to then move the handle 15 a sufiicient distance in the direction of the arrow B so that the latch 64 will properly engage with the armature 50 thereby insuring the automatic opening of the switch blade 35 prior to the opening of the switch blade 32.

I have shown one form of construction embodying my invention, but it will be evident that many changes and modifications may be made therein which will fall within the scope of my invention. Therefore, I do not limit the annexed claims to the specific device illustrated and described, but desire to cover all modifications and substitutions which come within the scope and spirit ci my invention.

I claim:

1. A circuit controlling device comprising in combination, a circuit breaker and a switch connected in series in a circuit, a trip mechanism to automatically hold the circuit breaker in its closed position, an electromagnet to operate the trip mechanism and having a core acting as the axis for the switch and circuit breaker, means on the `switchrto engage the trip mechanism when the switch is closed and to trip `the mechanism and release the circuit breaker when the switch is moved to its open position, but before vthe switch has opened.

2.` Af circuit controlling device comprising in/combination, a rotatable core of magnetic material, means 'to operate the core about itsv axis, a switch blade mounted on the core -to rotate therewithya circuit'breaker mounted upon the lcore and arranged to rotate relative thereto about the axis of the core,

means to move `thefcircuit breaker to an 4 open postion,'means to close the circuit breaker whenthe core is rotated in one direction, a e011 surrounding the core to energize the core and' connected 1n series with the circuit breaker, a trip mechanism to hold the circuit breaker in a .closed posit-ion and means -on the mechanism operated by the energized core to trip the4 mechanism and release the circuit breaker when the circuit in the coil exceeds a predetermined amount. 3. A circuit controlling device comprising in combination, a rotatable core of magnetic material, a coil sulrounding the core to energize the core, means to rotate the core, av switch mounted on the corel to rotate therewith to an open'or a closed position, a circuit breaker mounted on the core to rotate relative thereto about its axis and in series with the switch to open or close a circuit, means tending to open the'circuit breaker, trip mechanism to hold the circuit breaker closed and arranged to trip and release the circuit breaker' when the core is energized beyond a predetermined amount and arranged to coact with the switch lto be tripped by the opening movement of the switch.

4. A circuit controlling device comprising a receptacle divided into two compartments. by a transverse partition integrally` formed with the sides of the receptacle, a removablecover for each compartment, a transversely disposed and rotatable core passing through the partition and one cover, a circuit breaker' mounted on` the core within one compartment and to rotate relative to the core, means to rotate the core, an enerv gizing coil mounted on the core and within the other compartment, a trip mechanism to hold ythe circuit breaker closed, means tending to open the circuit breaker, means on the core and operated thereby to close the circuit breaker or to open the circuit breaker by ing in combination, a circuitbreaker anda switch. in series and controlling a circuit and rotatable about a common axis, a. rotatableafnd energizable core having an axis common with the aforesaid axis and operating when rotated 'to o en or'close the 'said' switch and circuit brea rer dependingv upon the direc-A tion of rotation, a coil to energize the core and trip mechanism to hold the circuit breaker closed and operated bveither the Aover energization or rotationl of the core to release the circuit breaker.

7. A trip mechanism -or holding aeircuit breakerl in one of its positions, an elec-l tric magnet having its coll energized from a source ofpower, a frame, alever pivoted at of the armature to the influence of the magnet, means to regulate the normal relation lof the armature to the magnet, and adjusta-y ble means connecting the armature and the aforesaid lever to move .the lever out of the path of the circuit breaker when the current in the coil exceeds a predetermined amount.

8. A trip mechanism as characterized in claim 7 and having in addition manually voperated means to impart to the armature an action equivalent to that given it by the over energized mavnet to trip the circuit breaker at will of the operator.

- 9. A circuit controller comprising a switch bladel to make and break a circuit, a circuit breaker to *connect the circuit thereto and automatically disconnect it, a handle to manually operate the switch, means to control the opening of thev circuit breaker and to 4interlock with the switch blade and means to prevent the manual opening of the switch blade after once closing the circuit until the switch blade has moved a predetermined amount in closing.

10. A trip mechanism for holding a cir- 4 cuit breaker in one of its positions, an electric magnet having its coil energized from va source ofpower, a frame, a lever pivoted at one end and having a. roller at the other end to engage'in thrust relation the circuit breaker, an armature pivoted at one end and havmg its other end adjacent the eleetromagnet to be influenced thereby when the magnet is over energized, a spring and adjustment therefor to regulate the amount of resistance of .the -armature to the influence of the magnet, means to regulate the normal relation of the'armature to the magnet, ad`

justable means connecting the Aarmature and the aforesaid lever to move th lever out of the path of the circuit breaker when the current in the coil exceeds a predetermined amount, a'manually operated switch to engage and close the circuit breaker and to close the circuit, means on the switch to operate the armature when the `switch is operated manually toits open position after being closed to trip the armature lease the circuit breaker. A

1,1. In a switch device the combination of a support, 'a rotatable shaft mounted thereon, an operating handle secured to the shaft, a switch blade pivotallyv mounted on the shaft and adapted to engage a contact, holding means to automatica ly engage the yblade to maintain it in engagement with the contact,l means tending to move the blade out and reof engagement with the contact, means secured to the shaft to rotate therewith and having means to engage the blade when the handle is rotated in one direction and other means to engage the holding means when the handle is rotated a predetermined distance in the. other direction to trip the holding means and release the blade, the blade remaining closed when the handle is inan intermediate position.

12.` A circuit controlling device comprising in combination 'an automatic circuit breaker and a switch connected in series to control a circuit, holding means operated by the opening movement oi the switch to trip the circuit breaker, and means to prevent an opening movement ot' the switch after it has been partially closed until the switch has been fully closed and in position to engage .and trip the holding means upon an opening movement of-the switch.

13. A circuit controlling device comprising in combination an automatically openmg circuit breaker, means to hold the c1rcuit breaker 1n lts closed position, a hand Aoperated switch in series with the circuit breaker and having two positions and adapted to close the circuit breaker when moved in the direction of its open position and close the circuit when moved in the other direction, pivotally mounted means ada ted to engage the said holding means a ter the switch has been moved to' its fully closed position and to trip the holding means whenl the switch is later moved to its open position and means to prevent opening the switch after having once closed to any degree before the pivotally mounted means is in position to energize the holding means.

`14. A circuit controlling device comprising in combination a circuit breaker and a. switch connected in series, a trip mechanism to automatically engage and hold the circuit breaker in its closed position, means to engage and release the circuit breaker when the switch is lmoved toward its open position,

means to blowout the arc formed at the circuit breaker contacts whenopened, a receptacle of insulating material to confine the said flash and prevent its contact with surrounding gases, an opening in the receptacle and an inverted cup shaped insulating member over said opening and forming a passage with the receptacle to prevent pressure within thereceptacle and allow the escape of gases formed by the flash.

15. circuit controlling device comprising in combination a circuit breaker, means to move the circuit breaker to its open position, trip mechanism to hold the circuit breaker in a closed position, manually loperated means to. trip the circuit breaker at will and comprising a pivotally mounted member, a handle thereoma latch to engage the trip mechanism and mounted on the pivotally mounted member and an automatic operating pawl and ratchet mechanism to prevent movement of the manually operated means in one direction until moved a predetermined amount in the other direction.

1G. A circuit controlling device comprising in combination an'enclosing casing, a circuit breaker and a switch connected in series to control a circuit and mounted within the casing, a trip mechanism to hold the circuit breaker in a closed position and means to open thecircuit breaker when released, a rotatable core extending through one side of the case and projecting therefrom yand a' coil connected to a source of power to energize the. core, the core being arrangedto trip the trip mechanism and release the circuit breaker when the coil is overenergized and to open and close the eireuit breaker when rotated 'and a handle secured to the rotatablevcore outside the casing to operate the circuity breaker. i

17. A circuit control device comprising. in combination, a circuit breaker, a trip mechanism to hold the circuit breaker in a closed position until tripped by an electromagnet when the current in its operating coil exceeds a predetermined amount, a switch in series with the circuit breaker and held closed b friction and adapted to remain closed w ien the circuit breaker is opened by an overload but capable of operating the tripping mechanism when moved mammll to an open position, a magnetic blow-out coll and core acting upon the flash at opening the circuit breaker to extinguish the same and pivotal means on t/he switch to engage stationary meansto compel the switch to be moved a predetermined amount in the closed direction before it can be moved to its open position after once closing.

In testimony whereof I afiix my signature.

HoMER P. CHANDLER. 

